02.2004 Communication / USS
Siemens AG 6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.1-1
8.1 Universal Serial lnterface (USS)
This documentation describes the application of the Universal Serial
Interface Protocol (USS) for SIMOVERT MASTERDRIVES MC and VC.
The USS protocol is a simple serial data transfer protocol, defined by
Siemens AG, which is fully tailored to the requirements of drive
technology. A detailed description of the protocol specifications, the
physical interface, the bus structure as well as a definition of the
transferred net data for drive applications are documented in the
specification "Universal serial interface protocol USS protocol"
(Order No. E20125-D0001-S302-A1).
Using the USS protocol, a user can establish a serial bus link between
a higher-level master system and several slave systems. Master
systems can be, for example, PLCs or PCs. SIMOVERT
MASTERDRIVES drive converters are always the slaves on the bus
system. Furthermore, SIMOVERT MicroMaster, SIMOVERT P 6SE21
and 6RA23 and 6RA24 drive converters can be operated as slaves on
the USS bus.
The USS protocol allows the user to implement both automation tasks
with cyclical telegram traffic (→ a fixed telegram length is necessary) as
well as visualization tasks. In this case, the protocol with variable
telegram length is advantageous, as texts and parameter descriptions
can be transferred in one telegram without chopping up the information.
Introduction
NOTE
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